I noted that Romney gave away $3 million of the $22 million he
made that year in the form of two donations:

One to the Mormon church, for ~$1.5 million

One to "The Tyler Foundation" for ~$1.5 million

This is correct.

But I then went on to describe The Tyler Foundation as a
Boston-based charity that helps kids with epilepsy, an assumption
I made after a Google
search (en exact match in Boston? Of course it's the right "Tyler
Foundation"!)

Well, a sharp-eyed reader did some digging on this and discovered
that I was a bonehead. Specifically, the reader found that I had
the wrong Tyler Foundation. The right Tyler Foundation, it
appears, is a private legal entity controlled and funded by the
Romneys that gives smaller gifts to other charities.

This was a stupid mistake on my part, and I apologize for it.

So, what is this "Tyler Foundation" that gets so much of Mitt
Romney's money?

It's a private Boston-based legal entity that had more than $10
million in assets at the end of 2010.

Romney gave the foundation $1,458,807 million of stock
distributed from one of his investment vehicles in 2010, and the
foundation generated another $1.5 million that year from interest
and asset sales.

The foundation also gave away a total of $647,500 of gifts in
2010.

By far the largest one was to the Mormon church -- $145,000.

Combined with the $1.5 million Romney gave the church in another
direct cash gift, this means that Romney gave the Mormon church
nearly $1.7 million in 2010--about 60% his charitable donations
in 2010.

Who else did Romney give money to?

A motley assortment of organizations, including the George W.
Bush Library, the U.S. Equestrian Team, Harvard Business School,
Brigham Young, and several medical and children's foundations.